Thermohydrometer



H. W. EDEN THERMOHYDR OMETER Sept. 16, 1941.

Filed May 29, 1940 INVENTOR. b afolcwfidejw;

ATT ORNEY5.

Patented Sept. 16, 1941 THERMOHYDROMETER Harold W. Eden, Chicago, Ill., assignor to The Imperial Brass Manufacturing Company, Chicago, 111., a corporation of Illinois Application May 29, 1940, Serial No. 337,815

Claims.

My invention relates to measuring devices and particularly thermohydrometers of the sort regularly used to simultaneously measure temperature and specific gravity of a liquid. Among the objects of my invention is to provide a new and improved thermohydrometer which is capable of quickly and accurately measuring the temperature and specific gravity of a liquid.

Another object is to provide a new and improved measuring device for both temperature and specific gravity, which has a temperature responsive element positioned so as to be directly and immediately affected by the same portion of the liquid which is being used to obtain a measure of the specific gravity.

Still another object is to provide a new and improved device for the measuring of temperature and specific gravity at the same time, which includes a single element attached to seal a thermometer bulb in a space immediately adjacent a weighted specific gravity float and which includes a resilient portion providing a protective bumper for the float, preventing harmful contact thereof with the thermometer bulb; it being also the object to provide an open cavity with a passage leading through it, so as to direct liquid into a circulating path about the thermometer bulb when it is drawn into contact with the Weighted specific gravity float to enable the thermometer to precisely measure the temperature of liquid at the temperature immediately adjacent the float.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my thermohydrometer whereby the objects contemplated as well as other obvious objects are attained, as hereinafter more fully set forth, illustrated in the accompanying drawing, and covered in the appended claims.

With reference to the drawing:

Figure 1 is a vertical elevation view of my device.

Figure 2 is a vertical section of the lower part of the device taken on the line 2-2 of Figure 1, showing the weighted specific gravity float and the thermometer mounting.

Figure 3 is a vertical section taken on the line 3--3 at right angles to the section shown in Figure 2.

Figure 4 is a cross-sectional view taken on the line 44 of Figure 2.

In the construction of measuring means for taking the measure of both temperature and is incorporated in such a specific gravity simultaneously, it is necessary that the liquid being measured have the same characteristics at the places where both measuring devices are in contact with it. A variation in temperature has a direct effect on the apparent specific gravity. When it is borne in mind that the measuring apparatus itself is often at a temperature different from that of the liquid to be measured, as for example in zero Weather, it will be understood that considerable variation in temperature may be present in liquid drawn into different parts of the interior cavity. Unless the liquid is free to circulate about both types of measuring devices it must be read instantaneously before there is a change in the temperature brought about by cooling due to the coldness of the measuring instrument itself.

Gtherwise the measuring instruments must be responsive to the liquid at the same, precise spot, so that liquid of the same temperatur characteristics affects both.

In the embodiment of my device, herein shown to illustrate my invention, a compact arrangement of thermometer and specific gravity float way that liquid which afiects the float flows directly past and into contact with the thermometer bulb placed immediately adjacent the float.

In the drawing there is shown a transparent barrel l0 having'a suction bulb 12 at the upper end, and a nozzle fitting M at the lower end. In normal use a hose 16, extending from the nozzle, is inserted into a liquid and the bulb l2 pressed and then allowed to expand drawing liquid up through the hose l6 and into the barrel II) where the measurements of specific gravity and temperature are made. v

Within the barrel there is provided a Weighted float l8 which has a tubular upper end 20 graduated and bearing numbers on a visible scale. The lower end 22 of the float is weighted, with shot for example, to give it the proper buoyancy. The body of the float is only slightly smaller than the inside diameter of the barrel, to permit its freedom of movement up and down when liquid is drawn into the barrel.

The nozzle 14 has in it an aperture 24 which is adapted to snugly receive a lower end 26 of the barrel which is belled out at the bottom edge in order to form a tight joint. At the lower end of the barrel and to the right as viewedin Figure 2 there is provided an opening 28. It will be noted that the opening is well toward the lower end at'a point within the aperture 24.

A resilient grommet 30 is shown inserted in the "spect to the lower end of the barrel.

I mometerlbulbp By:

'visible portion of the. v "fgraduatedscale 54 is out of contact with the stopped opening 28 forming a tight seal around the edge. The grommet has at its inside end a recess 32 which opens laterally and downwardly with re- Ori the upper side of the recess a portion of the grommet extends into the barrel beneath the weighted float forming a flap 34. An aperture 35 forms a passage through the flap connectingthe recess 32 and the inside of the barrelicontaining the float at a point above the grommet.

In the grommet is likewise a passage 38 ex.-

V tending irom the recess outwardly within the opening 28 and at .the outer end of the. passage i side of thermometer having a ing in sealed relationship through the passage is an enlarged portion 48. Theouter end of the grommet likewise has an upwardly extendingarm 42 within which a continuation of the enlarge;

'ment extends.

A thermometer M;

the grommet. The shaft of the thermometer lies sealed. in the-.passage 3 8'. and. extends therefrom atxanza'ngle'in an' upward direction parallel to.

.outergen'd of the grommetwithin the enlargement 49. lngorder. to hold the sleeve steady it is pro.-

. V is shown-with-a bulb dt positioned within the recess 32 at the innerend. of a vided with 'a'resilient collar: surrounding the I .barrel inwhichisa recess. EZadapted to receive the, upper endofithe sleeve 48. Within the sleeve there ;is provided a scale graduated and marked to indicate degrees. V

In operation liquid is drawn into the barrel l0 .through the.- hose;l 6, and nozzle I4. passes into the barrel it 2,4 Then the level of liquid gradually rises within 'the barrel until. it surrounds the weighted I 58.1 As liquid passes from th'e lower. end. oi barrel to, its position around the lfloa t, it flowsaround and'into contact with the thermometer bulb 4G. Theflap at the inner end or thegrommet serves to deflect liquid directly toward the thermometer bulb, a large portion of which is by-passed through the aperture 36. Since it isflonly a. relatively short distance be- "tween .thethermometer bulb 45 and the weighted :floatfthe temperatureof'liquid afiecting the float is immediately registered on. the thermometer bulb without appreciable ,variation- Moreover, any slightlchange in thetemperature of liquid surrounding thef'float dir ectly affects the therreason of the-fact that the thermometer adjacent the liquidi'being,measured,Vthe temperature can be quickly and" easily read atthe same time as the reading is taken 'of' the specific gravity by means of. the figures on the tube 20'. Y

When the liquid has been measured and. is

. expelledj'out of'fthe barrel the specific gravity float ordinarily descends quite rapidly. In the fapplic a'nt s device the float on descending is and cushioned by the relatively thin re.-

silient fiapt l; which formsfatthe same time a partition'for'the recess 32. By this simple device 'whichse'rves'a' double purpose; damage. to both float and thermometer bulb isavoi'd'ed.

There has 'thus been provided a sensitive, accurate measuring device for both specific gravity andflt m'peratureof a liquid, .which is compact 'iri'it's'arrangementiand certain in operation. fI claim as my inventionz a mnfabu h rom sr melding a barrel vin alateral openin d cen one e an @QBEWIfid-z G d? ifo mm .a; nozzleat said end for As liquid, firstenters the aperture T f' P for liquid drawn. into the the other end and a weighted gravityiloat shiftable endwise in the barrel, the combination ofa grommet of relatively soft material having a passage therethrough; positioned with one end projecting through the lateral barrel opening, an

open recess at the inside endof the grommet, a portion of said insideendextending into the barrel beneath. the float providing a cushioned support therefor, the other end of said grommet being grommet with one end covering; the passage therethrough, and a thermometer having a bulb the recess formed by thegrommet extending in sealed relationship through the passagein saidgrommet and extending upwardly within the measured. r

3. In a bulb hydrometer including a trans"- parent barrel having a lateral opening adjacent one end, angapertu-red capforming a nozzle at said end'forattachinga hose, a suction bulb at the other end and a weighte'd' gravity float shiftable endwise in the barrel, the combination of 'a grommet of resilient material having a passage therethrough positioned with one end projecting throughthe lateral barrel opening, an open tocess at the inside end-of the grommet, a portion ofsaid inside'end extending into the barrel beheath the float providinga cushioned support therefor, and an aperture through the support comprising a lay-pass for liquid flowing around the bulb, the other end of said grommet being outside the barrel, a sleeve oftransparent mate'- rial containing a'scale connected to the grommet with one end covering the passage thereth-rough, means on the barrelsupporting the other end and a thermometer having a bulb in the recess positioned with oneend projecting through the lateral barrel opening, a'downwardly open recess outside the barrel", a'sleeve of transparent material containinga scale connected to the V at the inside end of the grommet, a portion of said inside end extending across the interior of the barrel beneath the float providing a cushioned support therefor, and an aperture through the support comprising a by-pass for liquid flowing around the bulb, the other end of said grommet being outside the barrel and having a vertically extending portion and an enlarged aperture therein, a sleeve of transparent material containing a scale mounted with one end in said aperture, a resilient collar on the barrel supporting the other end and a thermometer having a bulb in the recess of the grommet extending in sealed relationship through the passage in said grommet and extending upwardly within the sleeve forming thereby a visual temperature indicator for liquid drawn into the barrel to be measured.

5. In a bulb hydrometer including a transparent barrel having a lateral opening adjacent one end, an apertured cap forming a nozzle of rubber-like material at said end for attaching a hose, a suction bulb at the other end and a weighted gravity float shiftable endwise in the barrel, the combination of a grommet of resilient material bent at a substantially right angle having a passage therethrough positioned with one end projecting through the lateral barrel opening, a laterally and downwardly open recess at the inside end of the grommet, a flap on the upper side of the recess extending into the barrel beneath the float providing a cushioned support therefor and an aperture through the flap comprising a by-pass for liquid flowing around the bulb, the other end of said grommet being outside the barrel and having a vertically extending portion and an enlarged aperture therein, a flat sleeve of transparent material containing a scale mounted with one end in said aperture, a resilient collar on the barrel supporting the other end, and a thermometer having a bulb in the recess of the grommet extending in sealed relationship through the passage in said grommet and extending upwardly within the sleeve forming thereby a visual temperature indicator for liquid drawn into the barrel to be measured.

HAROLD W. EDEN. 

